How to find duplicate data in the EXCEL File in c#?

Question

1.00/5 (1 vote)

See more:

I am uploading excel file. I want to check a column in the excel(Employee Id) is unique or not. Currently I am fetching the excel data to a dataset.
I want to validate the column mentioned say Employee Id .

Tried this option:

C#

var duplicates = result.Tables[0].AsEnumerable()
                                            .GroupBy(r => r["MOLId"])//Using Column Name
                                            .Where(gr => gr.Count() > 1)
                                            .Select(g => g.Key);

But not working where MOL ID is the column data to be validated whether it's unique or not.

Posted 8-Sep-15 20:57pm

Kandiya

Add a Solution

Comments

Sarath kumar.N 9-Sep-15 6:40am

can u share your table details?

Maciej Los 9-Sep-15 11:30am

Unclear! We need more details, because we can't read your mind or direct from your screen.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sarath kumar.N · Answer 1 · 2015-09-09T00:42:00

Solution 1

Try this.

C#

var qry =  from p in tableName
           group p by p.columnNameinto grp
           where grp.Count() > 1
           select grp;

foreach (var product in qry)
{
    MessageBox.Show("Duplicate Found!");
}

Posted 9-Sep-15 0:42am

Sarath kumar.N

Comments

Maciej Los 9-Sep-15 11:28am

Is there any difference between your query and OP's query?